Apparatus for the production of castings



Filed Aug. 1s. 1938 Patented eb. 4, l 941 flmflTEl-J STATES PATENT oFFlCE Y." Y Y APPARATUS FOR THEIAPRODUCTIN 0F CASTINGS -aeorg Pemetzrieder, Berlin-Tempelhof, Germany, or to Georg Pemetzrieder Metallgiesserei G. m. b. H., Berlin, Germany Application August 1'9, 193s, serial No. 225,695 In Germany August 21, 1937 aclantis (olaz-ss) -It ls knawnto take liquid material from a centrifugal drum through plunger pipes and to lead it into casting molds which are indpendent of the movement of the centrifugal drum..

, siderable diiliculties.

Moreover, centrifugal devices are known which operate with casting molds which are independent of the movement of the centrifugal device and arranged below the rotating centrifugal device, in which devices, contrary to the invention, the liquid metal vmust be transferred into the mold by separate gas pressure. c

This method, however, does not allow continuous working, whichobjection is overcome according to the invention in that the'liquid material subjected -to the action' of centrifugal force in a rotary centrifugal drum flows through the passages of a casting nozzle arranged within the centrifugal drum, and by which the centrifugal force is braked or eliminated during the casting operation.

An apparatus for producing castings according to the invention is illustrated by way of example in the accompanying drawing, in which:

Fig. 1 shows the appartus in vertical section.

Fig. 2 shows a detail in elevation.

The apparatus-consists of a centrifugal drum having a charging aperture and which, when employed for metal, is equipped with a refractory lining 2 and has at the bottom end a central aperture 3 through which an extension 4 of a casting nozzle 5. of refractory material extends which has several radial, preferably inclined passages 6 which lead into the discharge passage 'I in the extension 4.

If the casting nozzle rests on the bottom of the centrifugal drum when the apparatus is started up, its bearing surface may be constructed as a narrow shoulder I9 or. as shown in Fig.' 2, have radial grooves l tapering'towards the centre so that only ribs remain which rest on the bottom of the drum I.

However, it is not necessary to pack the drum bottom against the liquid material because the centrifugal force of the rotating material forces it back from the central aperture 3 as long a-s A by means of a bead the apex of the centrifugal parabolalies below the bottom. For this reason the spac'e below the casting nozzle 5 may be of any shape and relatively high. A

The control ofthe casting nozzle may be attained by suitable arrangements outside the drum instead of by the frictional drive within the drum I 9 or by the ribs between the grooves 8. Y t y The drum is surrounded by a stationary `casing 9' and supported .by guide rollers I0. which are mounted in a suitable manner on the casing 9. The drum I is driven from a friction rim II with which meshes a friction wheel I2 of an electric motor I3 adjustably mounted in a suitable manner on the casing 9. Guide rollers I4 are provided as bearings for the drum I.

'I'he casing 9, whoseaxismay be inclined or, if the drum lining is correspondingly shaped, may be horizontal, is preferably mounted on legs I5 whichare preferably supported on wheels IB.

manner:

Before the drum I is charged with molten metal the preheated drum i-s rotated by the electric motor I3, during which rotating the exten-v sion 4 rests on the bottom of the drum and thus participates in the rotary movement of the drum.

After the metal has been centrifuged for a short time, the clutch element I8 is raised by the lever so that it rst bears against the clutch part I'I of the extension 4 of the discharge nozzle 5 and partly or completely .stops the rotary movement of this nozzle 5.

,.A-s, however, the drum rotates continually the centrifuged material, under the action of the centrifugal force and of the continuous recharging of material, flows into the passages 6 of the casting nozzle 5 and out of the passage 1 into the mold.' When the casting mold is full, the nozzle`5 is lowered by means'v of the lever 20 and the material still contained therein returns into thel drum-under the action of the centrifugal force and material only again flows out through the nozzle 5 when braking takes place once more.

The apparatus according to the application oiers, besides other advantages, that advantage that the whole content of a smelting furnace can be run through a relatively small centrifugal apparatus without any interruption whatever.

The apparatus is also very simple, easy to operate and owing to its simplicity very robust.

participating in the rotary movement thereof,

and means on said casing forbraking said nozzle to eect the discharge of the centrifuged metal through said es by the action of gravity.

2. A`casting apparatus as specied in claim 1, in which 'the nozzle has a narrow shoulder on its under side bearing against the rim of the aperture in the drum.

3. A casting apparatus as specified in claim 1, in which the nomle has onits outer surface facing the bottom of the drum radial grooves tapering towards the centre and forming ribs adapted to bear against the bottom oi.' the drum.

GEORG ER. 

